"I'm still trying to get into the editing room and cut down on my ass time," he says of the frequent scenes in which he bares his bottom in his latest film. "I’m like, 'Oh my God, my mom's gonna see that!' "

Not concerned with Timberlake's mother's reaction to the nudity-laced flick, the actor's costar Mila Kunis, 27, believes the more booty shots, the better.

"You've got a fine ass," the actress tels Timberlake during the interview.